Dermatome swivel double acting valve

ABSTRACT

A dermatome having a handle and an attachment including a valve, where the valve may include a first bobbin at least partially defining a first flow path and a second flow path, a second bobbin at least partially defining a first flow path, an inlet port at least partially defined by the second bobbin and an outlet port at least partially defined by the first bobbin. The ports of the valve may open in response to an application of a mechanical act to the attachment and the ports may close in response to the absence or removal of the mechanical act.

TECHNICAL FIELD

The disclosure is directed to dermatomes for surgically harvestinggrafts of skin. More particularly, the disclosure is directed todermatome valve assemblies.

BACKGROUND

Conventional dermatomes are used for cutting skin tissue to obtaintransplantable skin grafts. A skin graft is a patch of healthy skin thatis harvested from one area of the body or donor site to cover a damagedor skinless area of the body. Typically, a dermatome has a front endholding a flat blade to be placed in contact with a tissue surface and amotor to oscillate the blade from side to side to create a slicingaction which cuts the tissue as the dermatome is moved along the tissuesurface.

SUMMARY

The disclosure is directed to several alternative or complementarydesigns, materials and methods of using medical device structures andassemblies. Although it is noted that conventional dermatomes exist,there exists a need for improvement on those devices.

Accordingly, one illustrative embodiment may include a dermatome havinga handle extending from a cutting head and a valve or attachment systemconnected to the handle. The attachment or valve system may include afirst bobbin that at least partially defines a first flow path and asecond flow path, and a second bobbin in adjustable communication withthe first bobbin that also at least partially defines the first flowpath. The first bobbin may at least partially define an outlet port,where the outlet port communicates with an outlet flow through thesecond flow path. In addition, the second bobbin may at least partiallydefine an inlet port, where the inlet port communicates with an inletflow through the first flow path. The ports may operate to open thepaths in response to an application of a mechanical act to the valve orattachment system and the ports may operate to close the paths inresponse to the removal or absence of the mechanical act.

The above summary of some example aspects is not intended to describeeach disclosed embodiment or every implementation of the claimeddisclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure may be more completely understood in consideration of thefollowing detailed description of various embodiments in connection withthe accompanying drawings, in which:

FIG. 1 is a top perspective view of a dermatome according to an aspectof the disclosure.

FIG. 2 is a cross-sectional view of a dermatome according to an aspectof the disclosure.

FIG. 3 is a side view of a dermatome attachment according to an aspectof the disclosure.

FIG. 4 is a cross-sectional view of a dermatome attachment while theattachment is in a closed position.

FIG. 5 is a cross-sectional view of a dermatome attachment withdirectional arrows indicating flows flowing through the aspect of thedisclosure depicted in FIG. 4, while the attachment is in an openposition.

FIG. 6 is an end view of FIG. 3 of the end of an aspect of the dermatomeattachment configured to connect to a handle of the dermatome.

FIG. 7 is an end view of FIG. 3 of the end of an aspect of the dermatomeattachment configured to connect to a fluid hose, where the end is anend opposite the end depicted in FIG. 6.

FIGS. 8A-8D are side cross-sectional views of a dermatome according toan aspect of the disclosure, where the dermatome is in different stagesof connecting to an exemplary fluid hose in each figured iteration.

FIG. 9 is a partial perspective view of a dermatome and a hose accordingto an aspect of the disclosure.

While the disclosure is amenable to various modifications andalternative forms, specifics thereof have been shown by way of examplein the drawings and will be described in detail. It should beunderstood, however, that the intention is not to limit aspects of theclaimed disclosure to the particular embodiments described. On thecontrary, the intention is to cover all modifications, equivalents, andalternatives falling within the spirit and scope of the claimeddisclosure.

DETAILED DESCRIPTION

For the following defined terms, these definitions shall be applied,unless a different definition is given in the claims or elsewhere inthis specification.

All numeric values are herein assumed to be modified by the term“about”, whether or not explicitly indicated. The term “about” generallyrefers to a range of numbers that one of skill in the art would considerequivalent to the recited value (i.e., having the same function orresult). In many instances, the term “about” may be indicative asincluding numbers that are rounded to the nearest significant figure.

The recitation of numerical ranges by endpoints includes all numberswithin that range (e.g., 1 to 5 includes 1, 1.5, 2, 2.75, 3, 3.80, 4,and 5).

Although some suitable dimensions, ranges and/or values pertaining tovarious components, features and/or specifications are disclosed, one ofskill in the art, incited by the present disclosure, would understanddesired dimensions, ranges and/or values may deviate from thoseexpressly disclosed.

As used in this specification and the appended claims, the singularforms “a”, “an”, and “the” include plural referents unless the contentclearly dictates otherwise. As used in this specification and theappended claims, the term “or” is generally employed in its senseincluding “and/or” unless the content clearly dictates otherwise.

The following detailed description should be read with reference to thedrawings in which similar elements in different drawings are numberedthe same. The detailed description and the drawings, which are notnecessarily to scale, depict illustrative embodiments and are notintended to limit the scope of the claimed disclosure. The illustrativeembodiments depicted are intended only as exemplary. Selected featuresof any illustrative embodiment may be incorporated into an additionalembodiment unless clearly stated to the contrary.

Referring to FIGS. 1, 2 and 9, a dermatome 10 for harvesting grafts ofskin tissue has a main body 12, with a head 14 (e.g., a cutting head)connected to a handle 16. Dermatome 10 may include a valve or anattachment 20 extending from handle 16 and configured to connect to afluid hose 100 capable of providing a pressurized fluid to a fluid motor(not shown) of a dermatome 10, as well as an exhaust pathway extendingfrom the motor of the dermatome 10 away from a sterile field of thesurgical procedure within which dermatome 10 may be used.

As seen in FIGS. 2-8D, valve or attachment 20 may include a system foropening (i.e., unobstructing) and closing (i.e., obstructing) fluid flowpaths into and out of handle 16. The valve system 20 may include a firstbobbin 30, a second bobbin 40, an inlet port 60 at least partiallydefined by second bobbin 40 and an outlet port 62 at least partiallydefined by first bobbin 30. The system of attachment 20 may furtherinclude a first flow path 22 at least partially defined by first bobbin30 (e.g., by an inner surface of a passage through first bobbin 30) andsecond bobbin 40 (e.g., between an outer surface of second bobbin 40 andan inner surface of receiver 90) and a second flow path 24 at leastpartially defined by first bobbin 30 (e.g., between an outer surface offirst bobbin 30 and an inner surface of casing 50) and receiver 90(e.g., between an outer surface of receiver 90 and an inner surface ofcasing 50). To either open and unobstruct or close and obstruct paths22, 24, inlet port 60 and outlet port 62 may be opened or closed,respectively, by a single operation on the structure of attachment 20.In operation, attachment 20 may allow fluid to enter an interior of adermatome to interact with a fluid motor driving the cutting blade wheninlet port 60 and outlet port 62 are open for the purpose of poweringthe dermatome or for any other purpose, such as driving the cuttingblade. Further, attachment 20 may operate to prevent fluid from enteringan interior of main body 12 of dermatome 10 when inlet port 60 andoutlet port 62 are closed.

FIG. 3 depicts a side view of attachment 20 that shows a housing orcasing 50 generally enclosing or surrounding the structure of attachment20. Casing 50 may be unitarily formed or may comprise two or more piecesinterconnected. As shown, casing 50 may include two members threadablycoupled together to facilitate assembly of internal components. Casing50 may take on any shape or size capable of generally enclosing thestructure therein and connecting to dermatome handle 16 and fluid hose100. For example, casing 50 may be generally concentric about thestructure therein. A first end 52 of casing 50 may be configured forconnection to fluid hose 100. The connection between fluid hose 100 andattachment 20 may be made by any hermetically sealed and releasableconnection technique known in the art. For example, the connectionbetween hose 100 and attachment 20 may be made using o-rings 18 andbearings or a bayonet locking system (as depicted in FIG. 9).

A second end 54 of casing 50 may be configured to connect to handle 16,as seen for example in FIGS. 1 and 2. The connection between attachment20 and handle 16 may be made by any hermetically sealed and releasableconnection technique known in the art. For example, the connectionbetween attachment 20 and handle 16 may be made using o-rings 18 andbearings so as to allow handle 16 to swivel with respect to attachment20. In other embodiments, attachment 20 may be permanently secured tohandle 16.

FIG. 4 depicts portions of the interior structure of attachment 20within casing 50. The interior structure may be generally concentricabout a centered axis A-A extending through attachment 20 from a hoseconnecting end 26 to a handle connecting end 28 in an elongateddirection of attachment 20. The structure may include first bobbin 30and second bobbin 40, along with a first spring 80, a second spring 82and an aerator or bobbin receiver 90. Within casing 50, bobbin receiver90 may receive first bobbin 30 and second bobbin 40, where first bobbin30 may extend through a first end 90 a of bobbin receiver 90 and secondbobbin 40 may extend through a second end 90 b of bobbin receiver 90.Further, in an exemplary aspect, first spring 80 may surround the firstend 90 a of bobbin receiver 90 and extend between first bobbin 30 and anexterior step 92 positioned between a first end 90 a and a second end 90b of bobbin receiver 90, while second spring 82 may be placed withinsecond end 90 b of bobbin receiver 90 and extend between second bobbin40 and an interior step 94 of receiver 90. As a result of theconnections, first flow path 22 may be defined by at least a hollowinterior of first bobbin 30, an interior of bobbin receiver 90 and anexterior of second bobbin 40, as seen in FIG. 5. As also shown in FIG.5, second flow path 24 may be an annular flow path concentric to firstflow path 22 and may be defined by at least the structure of an interiorof casing 50, an exterior of first bobbin 30 and an exterior of bobbinreceiver 90. In addition, second bobbin 40 and bobbin receiver 90 mayform inlet port 60 and first bobbin 30 and casing 50 may form outletport 62.

Inlet port 60 may include an o-ring 18, or other mechanism capable ofcreating a hermetic seal, on either second bobbin 40 or bobbin receiver90, or both, so as to provide the fluid tight seal when inlet port 60 isclosed. Similarly, outlet port 62 may include an o-ring 18 or othermechanism capable of creating a hermetic seal on either first bobbin 30or casing 50, or both, so as to provide the fluid tight seal when outletport 62 is closed. In an exemplary aspect seen in at least FIGS. 4 and5, o-rings 18 may be placed on second bobbin 40 and first bobbin 30,respectively, to provide the seal when ports 60, 62 are closed.

First bobbin 30 may be configured and located within casing 50, so as tobe capable of receiving and engaging a pressurized fluid hose 100 or afitting 120 thereof. As seen in FIGS. 4 and 5, first bobbin 30 may beunitarily formed and may have an elongated first end 32 extendinggenerally from a front face 34 a of an extension 34 and an elongatedsecond end 36 extending generally from a back face 34 b of extension 34.As seen in FIGS. 4 and 5, extension 34 may be a medial flange portion offirst bobbin 30. Although first bobbin 30 may be unitarily formed, itmay alternatively be formed of two or more pieces configured to connectto one another. In addition, first bobbin 30 may have a substantiallyhollow interior extending therethrough, as seen in FIGS. 4 and 5, wherethe hollow interior may be configured to at least partially define firstflow path 22.

Elongated first end 32 of first bobbin 30 may have an open terminal end33 configured to abut a ball of a ball valve 122 located within apressurized fluid hose 100. Between terminal end 33 and extension 34,elongated first end 32 may comprise at least one opening 35 configuredto receive a pressurized fluid via an inner lumen 106 accessed throughthe opening of the ball valve 122 within fluid hose 100. Fluid from hose100 may enter opening(s) 35 and flow through the interior of firstbobbin 30 and follow first flow path 22. Extension 34 may include afront face 34 a and a back face 34 b, where front face 34 a may beconfigured to engage casing 50 when in a closed position and back face34 b may be configured to engage first spring 80, as shown in FIG. 4,with first spring 80 surrounding elongated second end 36. Extension 34and casing 50 may form outlet port 62 and may work together to blocksecond flow path 24 when extension 34 is in a closed position. Extension34 or casing 50, or both, may include a seal (e.g., an o-ring 18) tocreate a hermetic seal at outlet port 62. Elongated second end 36 offirst bobbin 30 may extend to and within bobbin receiver 90. Elongatedsecond end 36 may directly abut an interior of bobbin receiver 90 or mayinclude a seal (e.g., an o-ring 18) to create a hermetic connectionbetween second end 36 and receiver 90, or both. Second end 36 may slidewithin receiver 90 in response to a mechanical act applied to firstbobbin 30 at front face 34 a, or terminal end 33 or at another location.As second end 36 slides within receiver 90, back face 34 b may act uponfirst spring 80 and second end 36 may contact and act on second bobbin40.

Second bobbin 40 may be a unitary piece or comprise more than a singlepiece where the pieces are releasably connected. For example, as seen inFIGS. 4 and 5, second bobbin 40 may be made of a stem 42 and a stem nut44 threadably engaging stem 42. Stem nut 44 may engage stem 42 at afirst end 42 a, as shown in FIGS. 4 and 5, or at any other locationalong stem 42. Stem nut 44 may include a first side 44 a and a secondside 44 b, with fluid ports 45 extending from first side 44 a to secondside 44 b. Fluid ports 45 may be discrete fluid ports, such as channelsor flutes, placed concentrically, or otherwise, about stem 42 or fluidports 45 may be a single hole extending annularly around stem 42. Secondside 44 b may abut second spring 82, where spring 82 may surround stem42 of second bobbin 40 and extend from second side 44 b to an interiorstep 94 of receiver 90. A second end 42 b of stem 42 may be locatedadjacent a second end 90 b of receiver 90 to form inlet port 60. Secondend 90 b of receiver 90 or second end 42 b of stem 42, or both, mayinclude a seal (e.g., o-ring 18) for providing a hermetic seal of inletport 60 when attachment 20 is in a closed position. Thus, whenattachment 20 is in a closed position, second end 42 b may engagereceiver 90 to close inlet port 60 and block first flow path 22. When inan open position, second end 42 b and receiver 90 may separate to openinlet port 60 and allow fluid to flow therethrough along first flow path22.

As seen in FIGS. 3-6, second end 54 of casing 50 located at a handleconnecting end 28 of attachment 20 may have a first portion 54 a with adiameter D1 and a second portion 54 b with a diameter D2, where diameterD2 may be smaller than diameter D1. An exhaust plate 56 may extend fromdiameter D2 to diameter D1 and may include exhaust holes 58, as shown inFIG. 6, configured to receive fluid flowing through second flow path 24and exhausted from the fluid motor. Exhaust holes 58 may take on anyshape or size located within plate 56. Plate 56 may be unitarily formedas part of casing 50 or may be a plate added to bridge a gap betweenfirst portion 54 a and second portion 54 b, for instance.

Second portion 54 b may form neck 70 and handle 16 may be configured toengage attachment 20 at neck 70 and first portion 54 a. Handle 16 mayengage neck 70 and first portion 54 a in any manner creating areleasable hermetic seal at the engagements. For example, the hermeticseals may be made through the use of o-rings 18 and those o-rings 18 maycircumscribe first portion 54 a and second portion 54 b or may be placedwithin an interior lumen (not shown) and annular lumen (not shown) ofhandle 16, or a combination thereof. Further, the interior lumen ofhandle 16 may connect to attachment 20 at neck 70 in any manner thatallows for handle 16 to swivel with respect to attachment 20. Forexample, neck 70 may include at least one indentation 72 at one or morelocations (axially or circumferentially, or both, displaced at more thanone location) around the outer circumference of neck 70 for the purposeof receiving ball bearings or other connectors from handle 16.Alternatively or in addition, neck 70 may comprise ball bearings thatengage handle 16. Further, indentation 72 may be an indented concentricring around the circumference of neck 70, as shown for example in FIGS.3-5, or any other indented shape.

An exemplary first end 52 of casing 50 located at a hose connecting end26 of attachment 20 is depicted in FIGS. 3-5 and 7. First end 52 may beconfigured for connection to a fluid or air hose 100. The connection maybe made through any connection technique desired. For example, a hose100 may be connected to first end 52 through a bayonet lock,complementary threading, or any other releasable connecting techniqueknown in the art. In addition, first end 52 may include one or moreseals (e.g., an o-ring 18) for providing a hermetic seal between firstend 52 and hose 100. Alternatively, or in addition, hose 100 may includeseals for providing the hermetic seal between first end 52 and hose 100.

Different stages of an exemplary engagement between hose 100 andattachment 20 are seen in FIGS. 8A-8D. FIGS. 8A-8D depict hose 100comprised of a fitting 120 engaged with an inner tubular member 102 andan outer tubular member 104, where fitting 120 may be used for making aconnection with attachment 20. Fitting 120 may comprise a first end 120a and a second end 120 b and may include a ball valve 122 located withinor proximate second end 120 b. First end 120 a may be configured forconnection to inner tubular member 102 and outer tubular member 104through any known connection technique. For example, the connection maybe facilitated with a glue substance or through a pressure fitting, suchas crimping or other technique. Further, first end 120 a may havechannels 124 extending from first end 120 a to second end 120 b for thepurpose of passing exhaust fluid to an annular lumen 108 of hose 100 orfor any other purpose. Second end 120 b may comprise an inner fittingportion 126 and an outer fitting portion 128. Inner fitting portion 126may be configured to engage first bobbin 30 and provide a hermetic sealtherebetween. The seal may be provided by, for example, one or moreo-rings 18 circumferentially arranged around first bobbin 30 or withininner fitting portion 126 or both. Ball valve 122 may be located withininner fitting portion 126 and may be activated (e.g., lifted off a valveseat) in response to interacting with terminal end 33 of first bobbin 30or may be activated in another manner. Outer fitting portion 128 offitting 120 may engage an exterior of casing 50, as seen for example inFIGS. 8B-8D, or another portion of casing 50 exterior of second flowpath 24. Such engagement may include providing a hermetic seal betweencasing 50 and outer fitting portion 128, where the hermetic seal may beprovided by, for example, either outer fitting portion 128 or casing 50including an o-ring 18, or a combination thereof.

In FIG. 8B, attachment 20 is depicted in a closed position and hose 100has begun engagement with attachment 20, where second end 120 b offitting 120 has initially engaged casing 50 and first bobbin 30. FIG. 8Cshows further engagement between attachment 20 and hose 100, whereterminal end 33 of first bobbin 30 abuts ball valve 122 and begins toallow fluid to flow from hose 100 through openings 35 of elongated firstend 32 of first bobbin 30. At the same time or at a proximate time, aterminal end 130 of inner fitting portion 126 may engage front face 34 aof first bobbin 30 and place a force thereon sufficient to overcome theforce of first spring 80 to move first bobbin 30 to open outlet port 62.It is noted that when outlet port 62 is initially opened, first bobbin30 may not yet have moved into engagement with stem nut 44 of secondbobbin 40 to open inlet port 60.

FIG. 8D depicts full engagement of hose 100 with attachment 20, wherefirst bobbin 30 has been displaced a requisite amount by the connectionbetween hose 100 and attachment 20 to open inlet port 60 along withoutlet port 62. Inlet port 60 may open in response to first bobbin 30contacting, and applying a force on, first side 44 a of stem nut 44 ofsecond bobbin 40, where the applied force overcomes the force of secondspring 82 to activate and move second bobbin 40. Thus, a fully attachedhose 100 opens the valves of attachment 20 allowing fluid to flow froman inner lumen 106 of hose 100 through first flow path 22 withinattachment 20 to fluid motor (not shown), and then exhaust fluid fromthe fluid motor to and through second flow path 24 to annular lumen 108of hose 100 via channels 124 in fitting 120.

Although FIGS. 8A-D depict the attachment of hose 100 to attachment 20as an iterative process, the attachment may be achieved in one or morefluid steps, where, for example, a force from fitting 120 engagingattachment 20 overcomes a biasing force of springs 80, 82 and inresponse to the force, first bobbin 30 moves a sufficient distance toengage and press against second bobbin 40 to move second bobbin 40. Thisexemplary process ensures an outlet flow path may be opened prior toopening an inlet flow path.

Applying or connecting a hose 100 to attachment 20 may include theapplication of a single mechanical act to attachment 20; for example,the mechanical act may be the placing of a force or pressure greaterthan a threshold pressure or force on first bobbin 30 through terminalend 130 of inner fitting portion 126, or other portion of fitting 120 orhose 100, where the threshold pressure or force is a sufficient pressureor force to overcome a biasing force of springs 80, 82. The singlemechanical act may be solely the application or connection of a hose 100to attachment 20 or the connection of a hose 100 to attachment 20 suchthat fluid from hose 100 communicates with first flow path 22 or simplythe application of a pressurized fluid against the first bobbin 30, orother mechanical act. Alternatively or in addition, an act acting onattachment 20 may include an electrical signal or other type of act orsignal.

During the application of the single mechanical act, outlet port 62 maybe opened prior to inlet port 60 opening, as seen from FIGS. 8B-8D, orports 60, 62 may be opened simultaneously in response to the presence ofthe single mechanical act. In one example, the mechanical act may be theapplication of at least a threshold pressure of thirty-two (32) poundsper square inch (psi) or ˜2.2 bars of pressure, or any other desiredpressure or force level, to front face 34 a and terminal end 33 of firstbobbin 30. In other instances, the threshold pressure may be set tosixteen (16) psi or more, twenty (20) psi or more, twenty-four (24) psior more, twenty-eight (28) psi or more or thirty-six (36) psi or more oranother desired amount of pressure or force. The amount of pressureapplied to first bobbin 30 may be any pressure proportional to acombined or effective spring constant of first and second springs 80,82. An exemplary effective spring constant would have enough pressure tokeep inlet and outlet ports 60, 62 closed during washing andsterilization of dermatome 10. Further, in response to the absence orremoval of the single mechanical act, ports 60, 62 may be closed and mayremain closed until a further application of the mechanical act.

After or prior to using the above described system in an operation orother event utilizing a dermatome 10, it may be desirable to wash orsterilize dermatome 10. It has been realized that it is advantageous toprevent washing or sterilizing materials from entering the interior ofdermatome 10. Such prevention of unwanted material within dermatome 10during washing and sterilizing may be achieved by keeping inlet andoutlet ports 60, 62 of attachment 20 in a closed position throughout thewashing process. A closed position may be achieved, automatically orotherwise, by removing the application of the single mechanical act(e.g., removal of the applied force from the hose connection or otherexternal pressure source) to attachment 20. Once the single mechanicalact is absent, springs 80, 82 act on bobbins 30, 40 to close inner andouter ports 60, 62, respectively, which essentially may block first andsecond flow paths 22, 24. Such blockage, in addition to other hermeticseals of the system, will prevent unwanted materials from enteringdermatome 10 and interacting with the fluid motor (not shown) and otherinterior parts of dermatome 10 throughout the washing or sterilizationprocess. Accordingly, with hose 100 decoupled from attachment 20 ofdermatome 10, inlet and outlet ports 60, 62 may be automatically closedsuch that dermatome 10 is ready to be washed or sterilized. Thereafter,dermatome 10 may be washed or sterilized without permitting fluids fromthe washing/sterilization process from entering into the internalcomponents of dermatome and adversely affecting the performance and/orintegrity of dermatome 10. Upon completion of the washing/sterilizationprocess, hose 100 may be reattached to attachment 20 of dermatome 10 foruse in a medical procedure.

Those skilled in the art will recognize that the present disclosure maybe manifested in a variety of forms other than the specific embodimentsdescribed and contemplated herein. Accordingly, departure in form anddetail may be made without departing from the scope and spirit of thepresent disclosure as described in the appended claims.

What is claimed is:
 1. A dermatome comprising: a handle extending from acutting head; and a valve connected to the handle, the valve including:a first bobbin having a medial flange portion and at least partiallydefining a first flow path and a second flow path; a second bobbin inadjustable communication with the first bobbin and at least partiallydefining the first flow path; an inlet port at least partially definedby the second bobbin, the inlet port communicating with an inlet flowthrough the first flow path; and an outlet port at least partiallydefined by the first bobbin, the outlet port communicating with anoutlet flow through the second flow path; and wherein in response to anapplication of a mechanical act to the valve, the first flow path isautomatically opened at the inlet port and the second flow path isautomatically opened at the outlet port; and wherein in response to anabsence of the mechanical act, the first flow path is automaticallyclosed at the inlet port and the second flow path is automaticallyclosed at the outlet port.
 2. The dermatome of claim 1, wherein thefirst bobbin has a hollow interior partially defining the first flowpath, and the first bobbin has an exterior surface at least partiallydefining the second flow path.
 3. The dermatome of claim 2, wherein thesecond bobbin includes a first seal at the inlet port, and wherein thefirst bobbin includes a second seal at the outlet port.
 4. The dermatomeof claim 3, further comprising: a bobbin receiver at least partiallydefining the first flow path and the second flow path and at leastpartially encircling the first bobbin and the second bobbin; wherein thefirst bobbin adjustably communicates with an interior of the bobbinreceiver; and wherein the first seal engages the bobbin receiver at theinlet port to obstruct the inlet flow through the first flow path inresponse to the absence of the mechanical act.
 5. The dermatome of claim4, wherein the bobbin receiver comprises an interior step and anexterior step; a first spring operationally extending between theexterior step and the medial flange portion of the first bobbin; and asecond spring operationally extending between the second bobbin and theinterior step.
 6. The dermatome of claim 1, further comprising: a casingencompassing the first flow path and the second flow path.
 7. Thedermatome of claim 6, further comprising: a bobbin receiver at leastpartially surrounding the first bobbin and the second bobbin; a firstseal abutting the bobbin receiver to close the first flow path at theinlet port; and a second seal abutting an interior step of the casing toclose the second flow path at the outlet port.
 8. The dermatome of claim7, wherein the casing is concentric about the first and second bobbins,and the interior step extends along an interior circumference of thecasing.
 9. The dermatome of claim 1, wherein the second bobbin includesa stem and a stem nut configured to connect to the stem.
 10. Thedermatome of claim 1, wherein the application of a mechanical actcomprises connecting a hose to the valve.
 11. The dermatome of claim 1,wherein the medial flange portion of the first bobbin includes a face,and wherein the application of a mechanical act comprises applying apressure to the face, the pressure having a pressure level of at least athreshold pressure level.
 12. The dermatome of claim 11, wherein thethreshold pressure level is at least thirty-two pounds per square inch.13. The dermatome of claim 1, wherein the second flow path is concentricabout the first flow path.
 14. A dermatome comprising: a main body; andan attachment for coupling the main body to an air hose, the attachmentincluding: a fluid inlet path having an inlet seal; and a fluid exhaustpath having an exhaust seal and the fluid exhaust path is concentricabout the fluid inlet path; and wherein the inlet seal and exhaust sealare activated to seal the respective path in response to a singlemechanical act acting on the attachment.
 15. The dermatome of claim 14,wherein the single mechanical act is lowering a pressure level appliedto the attachment below a threshold pressure level.
 16. The dermatome ofclaim 14, wherein the single mechanical act is removal of a hose fromcommunication with the fluid inlet path.
 17. The dermatome of claim 14,wherein the fluid inlet path is concentric about a central axisextending in an elongated direction of the attachment.
 18. The dermatomeof claim 14, further comprising: a casing having a neck and encompassingthe fluid inlet path and the fluid exhaust path; and wherein the neck ofthe casing provides for a swivel connection to a dermatome handle of themain body.
 19. The dermatome of claim 18, further comprising: anindentation located on the neck and concentric to the neck; and whereinthe indentation is configured to provide for the swivel connection tothe handle.
 20. A dermatome comprising: a cutting head; a handleextending from the cutting head; a first bobbin; a second bobbin; abobbin receiver; a first spring communicating with the first bobbin andthe bobbin receiver; and a second spring communicating with the secondbobbin and the bobbin receiver; and a casing configured to connect tothe handle, and the casing surrounds the first and second bobbins, thebobbin receiver and the first and second springs.
 21. The dermatome ofclaim 20, wherein the bobbin receiver has an exterior and an interior;wherein the first spring communicates with the first bobbin and theexterior of the bobbin receiver; and wherein the second springcommunicates with the second bobbin and the interior of the bobbinreceiver.
 22. The dermatome of claim 20, wherein the casing has a swivellocation configured to make a swivel connection with the handle.
 23. Thedermatome of claim 22, wherein the swivel location comprises at leastone indentation in the casing; and wherein one of the at least oneindentation is concentric about the casing.
 24. The dermatome of claim22, wherein the casing has a neck configured to engage the handle; andwherein the swivel location is along an exterior of the neck.